Stud



FIG. 1 is a perspective view of a stud showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 4.

The broken lines present in the figures are included for the purpose of illustrating portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a stud, as shown and described. 